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This is an example of how you can get around not knowing an answer in a multiple choice question by using some basic knowledge and powers of deduction.

(a) "it keeps the cell in shap...

Active transport is another method by which molecules are transported into and out of the body. It is the movment of solutes that have been dissolved in water into and out of the cell against their con...

The red blood cell is an animal cell therefore has no cell wall and will change its shape and seize dependent on the concentrations of solutions around it. When placed in a more dilture solution a red ...

Osmosis is the movement of water from areas of high concentrations to lower concentrations across a semi permeable membrane. It occurs over these membranes in  cells of the body alllowing water to move...